Everything About Hermit Crab Molting

Hermit Crab Molting

Hermit crab does not have bones. Its body consists of body tissue, which is protected by the exoskeleton. Here comes the main part, because this exoskeleton does not grow. Therefore, the only way a crab can grow is to shed it periodically. This process we call Molting.

Molting is how a Hermit crab physically grows. When a Hermit crab molts it sheds the exoskeleton. That is all the hard skin on the legs and claws. Do not confuse it with changing shells.

When they molt they are soft and vulnerable. That is why you should not touch them while their exoskeletons are still soft. Keep in mind, that even in nature almost 90 % of invertebrate deaths are related to molting. So, do not reduce their chances of survival.

Molting Process and Stress Behavior

First of all, I would like to start off by saying that sometimes people also confuse the molting and stress behavior of the Hermit crabs. They believe, that losing limbs means molting. Well, it is not! Losing limbs has absolutely nothing to do with molting. Molting is the shedding and regrowth of the exoskeleton. If your Hermit crabs are losing their legs. It means incorrect temperature, humidity, environment, or post-purchase syndrome.

The molting process (the molt cycle) is the most important part of the Hermit crab’s life. If you think that it only happens with crabs from time to time and takes a few weeks, you are wrong. This process has 4 phases: inter-molt, pre-molt, molt, and post-molt. As a result, they spend most of their time (80 – 90%) getting ready to molt, molting, or recovering from a molt.

Note: Some time ago, I wrote an article about “Aquarium: Molting Process and Metabolism of the Dwarf Shrimp”. Like shrimp, Hermit crabs follow the same rules and principles. Check it out if you are interested.

Related article:

Signs of Incoming Molting (Pre-molt Phase)

At this stage, the old exoskeleton begins to detach from the skin, and the new exoskeleton begins to form below. There are some signs that your Hermit crab is going to molt.

1. Difference in behavior

Every Hermit crab has a personality. They prefer to eat a certain amount of food. They play or sleep a certain amount of time. In general, they act a certain way. So, when they are about to molt their behavior will change. For example:

  • Eating
    Your Hermit crab will eat a lot. Then for a few days before molting, they seem to stop eating and get very lethargic and lazy.
  • Changing Shells
    All of a sudden, your Hermit crab becomes uncomfortable with the shell it is wearing. It starts changing shells more often compared to normal behavior. In many cases, they prefer moving even into a smaller shell. People believe that with small shells it is easier for them to bury themselves.
  • Substrate Testing
    They may be trialing the substrate by digging holes in different places. They might just keep burying themselves coming up, burying themselves coming up, again and again. It seems like they are trying to find the best spot.
  • Lethargic Behavior
    They move less. Sometimes they start dragging their large claw almost under them as if it is too heavy.
  • Water Preferences
    Hermit crabs start spending more time near the water ponds.

2.Difference in appearance

  • Cloudy eyes
    Another molting sign is brownish eyes. Usually, your Hermit crab’s eyes are perfectly black and shiny. Cloudy eyes are a sign of an impending molt.
  • The color of the exoskeleton
    You will notice that the color of your Hermit crab looks a little bit dimmer or duller.

3. Fat pouch developing

One very interesting and very common molting sign is a fat pouch developing on the Hermit crab. You can see it inside the shell, on the right of the abdomen. It will get larger. Hermit crabs develop these fat pouches so that while they are buried they have some food so they do not starve.

4. Limb regeneration

If your Hermit crab does not have a limb, it will begin the process of regenerating it. At first, it looks like a small nub. However, as the time for molting grows near, it will swell and become more defined.
Note: Keep in mind that all of these signs not always occur and sometimes none of them do. 

Related article:

Types of Molting (Molting Phase)

During the molting phase, the old exoskeleton cracks, and the Hermit crab pulls out of it backward. While the tissues are still soft, they start increasing their size by using water, which they carry in their shell and the body. They create water pressure to stretch the new soft exoskeleton into a larger size.

Hermit crabs have only 2 ways of molting.

1. Underground Molting (safe and stress-free)
2. Surface molting (unsafe, when they are seriously stressed or sick)

Hermit Crabs and Underground Molting

When Hermit crabs are going to molt they will usually bury themselves entirely. They need depth, darkness, moisture, and heat to successfully molt. Thus, the most important that you can do – DO NOT dig it up.

Digging up a molting Hermit crab can lead to death. In nature, they do not need your help. Do not kill with kindness. When they buried just leave them alone.

Note: Normally Hermit crabs handle molts all on their own without many problems. The main danger is that in captivity, they are kept in a much smaller space and so are more likely to discover each other when they dig around. This is one of the reasons why you should not keep them in small tanks. This is why your tank should have at least 3 inches (absolute minimum!) of the substrate along the bottom so they could bury.

Related article:

Hermit Crabs and Surface molting

Surface molting is when a crab molts without burying itself. As I have just said, Hermit crabs usually molt underground. They will molt above ground only when they cannot bury themselves because of the substrate (unsuitable or not deep enough) or physical conditions (stress, illness, etc).

Do not try to bury Hermit crab yourself. You will make it only worse. During molting, they do not have the strength to create a new tunnel or cave underground. As a result, it can kill them.

However, you still can help your Hermit crab:

  • Make the substrate around molting Hermit crab soft and leave it on the surface of it.
  • Put any pieces of exoskeleton you found and (or) any other soft food that is easy to eat.
  • Cover the tank with a dark blanket, too to make them less stressed.

Important: If a crab has a surface molt you need to move all your other Hermit crabs away or they will eat it during the molting.

Isolation During Molting

One of the most important things you need to do when your Hermit crab is going to molt is to isolate it. This is the only way you can be sure that it will be safe from other crabs. The problem is that in this phase, molting crabs are soft, weak, and cannot fight back. Easy prey. In the wild, it happens pretty commonly actually.

Make sure to isolate your crab if you can. There are 3 ways to do that:

  1. Set up an isolation tank (ISO tank).

ISO tank should mimic your large tank (just smaller). It must have all the same stuff, a very deep substrate, pools of water, food, heaters, etc. You are only going to be putting one crab in there at the time.

  1. Divide your tank.

If you have a large tank and molting place allows it (for example, it is near the corner). You can section off part of the tank so the other crabs cannot reach the molding crab.

  1. Soda-bottle technique

Take a large soda bottle. Cut it in half. Rinse it out thoroughly. Make sure there is no soda left in there.  Use the upper half the one with the opening where the cap would be and you sink it into your substrate around your molting crab. This is an easy and safe way to isolate your Hermit crab.

Soda-bottle Technique Details

If you decide to use the soda-bottle technique, there are a few specific things you should know.

1. Use it only in the first few days when they buried.

When Hermit crabs bury to molt they make a little underground cave. The main idea of using the soda-bottle is to cover both your crab and their lair. Therefore, if you miss, you may collapse their cave. It will not be a big problem for a crab who has only been buried a few days. It is very likely it has not molted yet.  So, even if you do accidentally destroy the cave, it will be strong enough to either rebuild it or dig a new one elsewhere. However, this would be very dangerous for a crab that has already molted. It will not be strong enough to do anything. So, it can die there.

2. This method only really works for small Larger crabs and their caves just do not fit into the soda bottle.

3. If you have a big tank with a deep substrate (6 inches or 18 cm) and you have not had problems with crabs digging each other up. You may not need to use the bottle. After all, the best way to avoid cannibalism is to give your Hermit crabs plenty of substrate, space, and provide plenty of rich, high-protein, and calcium.  

Hermit Crabs and Post-molt Phase

When your Hermit crab comes up from the molt you will notice a few differences about it.

  • Usually, their exoskeleton (their claws and legs) are a much lighter color once they have resurfaced after a mol It appears pale for a few days before it fully re-hardens. Next, you notice that they are very brightly colored.
  • They have very long antennae.
  • Hermit crabs will have “hairy” legs (tiny black spikes). Usually, in nature, these spikes break off pretty easily but recently molted crab will have them yet (regrown them).
  • Hermit crabs become more active and move around a lot.
  • If your Hermit crab was missing any limbs before it went under for a molt, they will grew them back. Like all invertebrates, they can regenerate any of their limbs including their big claw.

Note: If they are regenerating an entire limb it might take a few months for it to actually fully grow. For example, at first, a leg or claw will be kind of thinner or smaller. In a few months should return to normal size.

Hermit Crab and Post-molt Bathing

It is very important that after your hermit crab comes up from its molt you bath it. You can just use regular freshwater like the kind you would use in their tank to do this.

The reason behind bathing is that they do not smell like their old exoskeleton. Unfortunately, in the wild, it is a delicious smell to other crabs. Of course, you do not want them to smell delicious because then they will be attacked. Therefore, bathing your Hermit crab is necessary. Always make sure to bathe your crabs after they molt.

Frequently Asked Questions About Hermit Crabs Molting 

Is Hermit crab dead or molting?

When Hermit crab passes away, you will know it without a doubt. The stench is unbearable. It almost smells like dead fish. Therefore, if you do not smell anything, your hermit crabs could be molting or just buried.
Note: If you pick up its shell and the body falls out, it is dead. 

Why Should I Isolate Molting Crab?

You should isolate all of your molting crabs separately. There is the possibility of cannibalism if they are together. If they are all molting successfully in your habitat then that means, you are doing a good job. 

How do you make sure that the soda bottle is covering the Hermit crab?

Really, how do you know where they bury themselves with the soda-bottle technique?

Often Hermit crabs dig to the bottom of the tank. So, you can find them by looking underneath through the glass on the bottom of the tank. If you cannot find your crab, in this case, I would not worry about it. It is more likely you will cause harm by digging it up than it is likely another crab will find it. 

How long does it Take Hermit Crabs to Molt?

It depends! The amount of time it takes a Hermit crab to molt is largely determined by the size of the crab. The smaller the crab the less time it takes to molt. Therefore, the larger the crab the more time it takes the crab to molt.  A small Hermit crab can take as little as 2 weeks to molt. For bigger Hermit crabs, it can take somewhere around 1 – 2 months.

Keep in mind that sometimes they will be buried for weeks without shedding, while others will bury and shed immediately. There is no real way to predict it.

Of course, it is hard to just sit and wait for a couple of weeks or months while your Hermit crab is under molting. Nonetheless, you have to understand is that this is a very stressful time for your Hermit crab. If you disturb your crab while it is molting you may seriously endanger it.

How often do Hermit Crab Molt?

It depends on the size of your Hermit crab and its environment. Smaller crabs (golf-ball sized and smaller) usually molt 2 – 4 times a year. Bigger crabs molt less frequently. As long as you are providing a good environment and a variety of food, your crabs will molt regularly.

Is Hermit Crab just digging or going to Molt?

Hermit crab keepers often ask, how do you know if your crab is molting or what if it is just digging?

Hermit crabs dig to molt, but they also dig to explore. Occasionally a crab will prefer to be underground during the day but come up at night. However, when they bury themselves and stay underground for over 24 hours, then you know they are probably molting or going to. A molting crab will stay underground in one spot for a long time. Some crabs do just dig for fun, but if the crab is staying underground he is probably going to molt.

Should I keep the food in the tank when my crab is molting?

Absolutely, yes. They can come up from the molt during night time and they will be very hungry. Give them something that is rich in calcium, like Cuttlefish bones (link to check the price on Amazon), etc. They definitely need calcium after the molt.

You can read some descriptions of these products in my article “How to Supplement Shrimp and Snails with Calcium”.

How deep my substrate should be?

Many Hermit crabs dig to the glass bottom of the tank. This may be a sign the substrate is not deep enough (3 inches is an absolute minimum). However, it is better to have around 6 inches of substrate. Ultimately, as long as the crab is completely buried, it should be able to successfully molt.


Molting is a very delicate and complex process for Hermit crabs. You want to make sure to have everything set up properly so your hermit crabs can mold safely.
Do not disturb them, be patient and your Hermit crab will be OK.

Related Posts:

  1. Hermit Crabs – Detailed Guide: Care, Diet, and Breeding
  2. Hermit Crab Tank Setup
  3. Hermit Crab Diet
  4. Hermit Crab Shells: What You Need to Know
  5. My Hermit Crab Has Left Its Shell
  6. Is Hermit Crab Dead or Molting?
  7. How long do Hermit Crabs live? Lifespan | Life expectancy
  8. Mistakes That Can Kill Your Hermit Crab

24 thoughts on “Everything About Hermit Crab Molting

  1. Hi, my hermit crab is molting on the surface and I’m freaking. I recently got them a proper set up after my sibling neglected them. As soon as I did one started molting above surface. It’s been a full day and he’s out of his old skin but just laying there. I also isolated him from the other two/ I can’t tell if he’s dead or just resting from the molt. Any reply’s would be helpful through this stressful time! Thanks

    1. Hi Calista Murray,
      The only advice I can give you is to be patient. If it is possible I would transfer other hermits to a new location while you are dealing with this problem.
      Just do not touch or bother the crab for some time. It is a very stressful time for it.
      Best regards,

  2. Hi. I just purchased a crab who is similar in size to my other two babies. His name is dusty. The others are berry and spike. I noticed dusty was very inactive and would chirp if anyone touched him. The whole ride home and even up until I put him in the crabitat he made minor movements within his shell. About 5-10 mins after being in the tank he quickly searched for a spot to bury himself. He chose a spot behind a bush I have in there, and he stayed half on the surface in that corner. I noticed spike was very interested and two days after berry was by him. It’s been about a week since I got dusty now, and I was concerned for him so I moved the bush and checked him out without touching him and keeping the other crabs on the other side of the tank. His big pincher is in front of him, I think I could see some legs. But the pincher was definitely looking hollow and chewed and so I quickly isolated him from the other two crabs again without moving him. I added a divider. My thing is, dusty does not smell. But I’m worried the other crabs hurt him. What should I do? Is he molting? Is he stressed? I noticed he was isolated from other crabs when purchased and severely inactive. The worker poked him!! And I was like please stop! Help my dusty 😭

    1. Hi Faith Bolieau,
      It does look like your Dusty is under stress or preparing to molt.
      Therefore, you did the right thing by isolating him from other crabs.
      Personally, I would not bother him. Keep giving him food and provide more dark places where he can hide and rest.
      Best regards,

  3. Hi Michael, my 7 year old hermit crab has not moved on the surface for 2 months. He usually molted under the substrate but I changed to the fake chips on calcium sand, and I think he is dried out. He appears dead. But, 2 weeks ago when I checked on him for the first time, he was still dark. Today he has pinkish orange exoskeleton but he hangs more out and I see some stuff on his eyes like skin or something very thin. His eyes are up but his antennae also look dead and lightened. I think he is dead because even though there is no smell or rot smell, his body has moved within the shell and if I tip it over he might fall out, but I’m afraid to and don’t want to disturb him. He does appear to be loose in the shell. He is quite large and I know it takes long to molt but he has not moved at night at all. I did move his position to another spot and started to mist the aquarium because this new substrate is not moist at all. I’m afraid he is dehydrated, dried up and hence why there is no rot smell, plus the substrate is dry. However, I don’t know for sure. He was sitting in water before all this so I know he was getting ready to molt but he might not have had the right water either, I didn’t know he needed both salt and fresh at the same time, I had removed one dish with the new substrate so he could have fresh or sometimes salt if I added solution. Also, there is no sign of bubbly stuff or exoskeleton that’s shed. He has absolutely not moved within his shell because I usually have heard him at night once in awhile during his molting, and this time nothing for 2 months and his shell has not changed position or moved.

    1. Hi Teresa Nickell,
      I am really sorry to hear that.
      I understand that you want to make sure that … there is no hope … before sending him on his last journey.
      Well, 2 months is more than enough. There is no point waiting any longer.
      Best regards,

  4. Hello I have a hermi that seems to be molting above ground, he became very active and even switched shells and climbed in and out of the fresh and salt water bowls. but today became very still and is not burried like the others but is also not moving he is half in and half out of his shell. I want to separate him from the others and put him another smaller habitat just because my colony has 9+ crabs that otherwise are doing fine and I don’t want to stress him more. I’d appreciate any help and can send pics

    1. Hi LA,
      I’ve sent you a message to your email, check it, please.
      Best regards,

      1. I can’t tell if my hermit crab is dead or molting. He’s not buried, and he’s stuck to the big shell we use for water. His one eye is cloudy while the other is not. My parents think he’s dead but I still think he may be molting. I already touched him once and I could’ve just killed him. He’s been in this state since May. Please help

        1. Hi Emily,
          I would gently remove the crab from the tank and observe it closely for any faint signs of life just to be certain.
          But based on your description, it unfortunately sounds like the crab has passed away rather than molting. It is way too much time.
          I’m sorry for your loss, but don’t blame yourself – you clearly cared about its wellbeing.
          Best regards,

  5. First time Hermit Crab caretaker and I thought my hermit crab was dead. I placed it in the used shell basket to clean it. At night I cleaned it and placed it back in the tank. I found out later it was still in the shell alive and then fell out of its shell. I tried to place it back in the shell (did not know better) as the other crabs wanted to eat Mr. Crabs. I placed it in a temporary tank in the tank with a lot of substrate, damp sand, water with saline, and some food. Is there a chance it will live at all? I am so scared I killed Mr. Crabs putting him back in his shell.

    1. Hi Angie Garbark,
      From your description, it is not clear what happened and how you could harm him. Did you take him out at first?
      In any case, I do not want to be a pessimist but the are chances are pretty slim.
      Best regards,

  6. Hi, I have had my hermit crabs for about 3-4 months now and I have four and I heard one of them chirping today so I went to check on them and I usually find them underground because they like to dig for fun and I did not except this to happen so soon but I found two of them molting at the same time and I ended up moving them to a separate tank forgetting not to move them when molting, but I have also put there exoskeletons by them and I did cover them up with a little bit of stuff, but now I’m worried that I might stress them out and they might die so I was wondering if they might be okay because I was delicate with them, put the two on there own side of the tanks with their own exoskeletons, and covered them up a little bit but not to much so they can breathe still. I need to know if they might be okay. Plz respond. 🙁

    1. Hi Dixie,
      Basically, you did best what you could. You separated them, provided them with cover and old exosceletons.
      They might be OK.
      Most crab owners have done the same mistake as you, do not blame yourself too much.
      Best regards,

  7. I found both of my missing hermit crabs! 🙂 My mind was going crazy with new theories like what if I accidentally left those 2 in the old tank or what if they hitched a ride on the driftwood while I cleaned their tank and escaped onto my bed and into the house lol. Well after months of anxiety and the tank starting to smell bad I got even more worried one or more of the 2 missing crabs died.

    Fast Forward my mom finally comes and visits and she brings my old aquarium back which is WAY bigger than I remember it being its like 3x the size of the one they were in. Its anywhere from 35 – 45 gallons.

    I got the 4 active crabs moved over into the new tank with a WAYYYY nicer setup since I have room to actually be creative now. I decided I needed to know what had become of the 2 missing crabs so I dug around very gently like an Archaeologist looking for dinosaur bones.

    I found the big huge girl first because I knew where her hidey cave was already. She wasn’t molting and or if she was she had finished. She looked very healthy and sucked into her shell. I found the tip of a bright orange foot by her, but none of her legs seemed to be missing anything. I checked multiple times while she was active in the new tank, all her leg sections were there.? O_o; If she wasn’t molting I was a bit confused how she’d survived down there for so long without coming up for food or saltwater for 3 months. She’s the biggest out of the 6.

    Anyways she’s VERY happy in the new tank, they’re all more active than I’ve ever seen any of them be. Almost nonstop every night all the way til like 10am when the sun is up. I’ve seen all 5 of them get fresh water, saltwater, and hit up their food dishes and have done full explorations of all their new driftwood and vines. They were so active last night I actually didn’t get any sleep because of their shells tinking against the glass. LOL <3

    The big girl jumped into a new shell finally and got out of the barnacle covered looking one she came in. Me and my roomate ordered new shells and there were 3 big ones that were all the same size and style but with different patterns and all 3 of the bigger hermit crabs have since purchase, jumped into those 3 shells. Other than the big girl the other 2 were actually in smaller medium shells before they jumped over but they did that in the old tank when I first got them.

    Anyways the other one that was missing, I found him too. I deduced it was spilled food pellets making the substrate reek, the hermit crab didn't smell bad. I lightly dug around with 1 finger til I felt his shell. I partially uncovered him to see he was VERY white like mid molt so I very gently pulled the substrate back over top of him and left him in the old tank. Its been like 3 months and hes my smallest one but I guess he really is just a slow molter.

    But yeah I found the 2 missing crabs, 1 is molting and the big girl is looking healthy and active as ever in her gorgeous new shell and her much bigger tank. I gotta make the substrate 4 or 5 inches deeper in the new tank (I ran out! ): ) but other than that the new set up is freakin awesome and I've never seen them so active and content. They LOVE to climb so much more than most people realize and they're freaking GOOD at it. They're crazy little spider-men.

    I was worried about taking care of these guys but they've all taken up new shells since I brought them home, the one missing legs grew his legs back, the one missing half an antennae grew that back (I think it was the same guy missing 2 legs, gosh you should've seen the cruddy beat up chipped up cracked shell he came in too and how much bigger and nicer his new shell is! He looks like a brand new crab!), and so far 2 of them have survived molting with a 3rd mid molt.

    Most of my anxiety is alleviated and I'm feeling more confident as a hermit crab owner now, I'm just hoping I didn't pester the one molting crab too much. I had White's Treefrogs for around 5 years, these guys are harder to take care of in all honesty. Phew!

    1. Hi Jesse,
      Great news, I am really glad for you! 🙂
      Best regards,

  8. I am a new hermit crab owner and I didn’t know my hermit crab was going to molt so I was digging him up each night and holding him while changing out his water and salt water and food, he never came out of his shell while I was holding him and he did re-bury himself. He eventually did molt, once I realized that is what had happened and realized I am not supposed to be unburying him I have left him alone. He still has his color. Do you think he will be ok?

    1. Hi Sara Levitt,
      In the end, he molted successfully, and that’s the most important thing. The most dangerous moment is behind. But for the future, of course, you need to be more careful. I believe that everything will be fine.
      Best regards,

  9. Hi, I was wondering if my larger hermit crab will molt soon and if the sand in my tank is too cold. When I set up my tank I washed my sand out and it wasn’t fully dry yet it was still moist and cold and I was wondering if it was too cold. Especially since when I set up my tank I put a section of soil on one side and put cilantro in it and my hermit crabs won’t go on the sand very much. I don’t know if they just really like the soil or just think the sand is very cold. Also, my larger hermit crab hasn’t moved very much and has dug and very small tunnel under the soil. He is still alive cause I have picked him up to check on him a few times and he comes straight out to crawl on my hand. My smaller crab has been a little active moving around a bit at night but has been laying next to Ozzie, my larger crab, a lot. Ozzie’s largest claw doesn’t fit in the original shell I got him in and I don’t know if that is a sign of him about to molt. I am also pretty sure my small crab, Harriet, has been eating and drinking cause when I check on them their food has been moved and there’s soil in their water bowls. I am just a bit worried cause I just got these crabs about 3 weeks ago and I am not totally sure about the signs of them being sick, dehydrated, cold, and about to molt. I am also wondering how I can keep my hermit crab tank warm cause it has been going below 70 degrees, I put a heat lamp in there but it doesn’t seem to be working very well.

    1. Hi lex Bearden,
      Do you know what species you have? Did you mix soil and sand?
      I have described the most obvious signs of upcoming molt but it’s important to remember that these warning indications are not always followed by a molt. I assume that it confused you when the crab started digging. Hermits do generally burrow when they are about to molt, but they also frequently do so to rest. 
      Anyway, I would not disturb or handle him, just to play safe. Keep an eye on their behavior and continue to feed them. 
      Regarding the temperature, since sand cools down very quickly, I would suggest looking at additional heating options for their crabitat.
      Best regards,

  10. Thank you! I’m pretty sure my hermit crabs are purple pinchers. I didn’t mix the sand and soil but I will cause that sounds like a good idea. Again thank you!

    1. Hi Lex Berarden,
      This way it will be easier maintain moisture. In addition, it will not cool down as fast as sand only substrate.
      You are welcome 🙂
      Best regards,

  11. Hello! Thank you for your amazing resource here. It’s well organized and very detailed. We gifted our 7 year old two hermit crabs for his birthday. They are both smaller than a golf ball. A month ago one of them disappeared into the 5 inches of sand substrate We’ve not seen him since. At one point I got curious and dug down gently and came across his shell. I didn’t move it and just recovered it with sand. I am nervous that it has died under there though. It has been a month and he is smaller so molt should be faster? At what point do we know it’s been too long and we should try to find his dead body and she’ll and dispose? My kid will be so sad! Thank again for your response.

    1. Hi Gabriella Fracchia,
      Thank you!
      Molting can be a delicate process. If the crab is molting, it’s important not to rush or disturb the crab during this time. It’s best to let nature take its course.
      When it comes to the question of how much time is enough for this, it’s probably one of the most frequently asked questions I receive in my inbox.
      What is the species?
      Some hermit crabs can be quite small, and despite their small size, they might actually be adults who require more time for molting. In any case, I would wait for another couple of weeks before attempting to dig it up.
      Best regards,

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